use socat

.travis.yml

@@ -20,6 +20,7 @@ install:
   - if [ "$TRAVIS_OS_NAME" = 'osx' ]; then
       brew update && brew install openssl;
       brew info openssl;
+      brew info socat;
       ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/;
       ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/;
       ln -s /usr/local/Cellar/openssl/1.0.2j/bin/openssl /usr/local/openssl;
@@ -30,6 +31,7 @@ install:
       openssl version 2>&1 || true;
       $ACME_OPENSSL_BIN version 2>&1 || true;
       export PATH="$_old_path";
+    else sudo apt-get install socat;
     fi
   
 script: